Worsening of COVID-19 after chemotherapy in patients considered to have recovered from a SARS-CoV-2 infection. Issue 1 (2nd January 2022) - Poncelet, Arthur; Verschelden, Gil; Colard, Martin; Hildebrand, Marc; Hites, Maya; Yin, Nicolas; Michel, Charlotte; Grimaldi, David; De Wilde, Virginie